How to check hardware raid on Redhat ES

[Ratzie]

We have a Dell poweredge 2850 with Hardware RAID

If I was not the one that installed the server I would not know if it was raided or not.

What commands are there to view the Hardware raid?

How would I know?

[Rick Garland]

There are several RAID types of HW/SW and drivers that are in use. There are several methods available depending on the HW/SW/drivers in use.

Couple of examples; acaraid & megaraid & megaraid2

What HW and/or drivers are in the system? Can use ther 'lshw' utility to see HW and 'lsmod' to see your modules loaded in kernel. (lshw is a download tool).

There are some provided with GUI tools as well.

Check out the following site.
http://developer.skolelinux.no/info/prosjektet/delprosjekt/hw-raid-info.html

[Ivan Ferreira]

You need a software provided by the manufacturer. HP provides the array configuration utility, so Dell should provide something similar.

Check the download page in the Dell site, for your Hardware model.

Otherwise, I think that a bootable CD or adapter BIOS is available to configure the RAID. If you want to know the configuration, you can do it "offline".

[Ivan Ferreira]

Also, you could more or less predict if you have hardware by listing the size of the disks, using fdisk -l.

In a RAID 1, you will have half of the total disk capacity available.

In a RAID 5, you will have N-1 disks capacity available.

And so on.

You should also consider that maybe there is a spare disk, that disk should not have activity, you can see it in the leds.

[Dave Falloon · Accepted solution]

Go to dell's linux page:

http://linux.dell.com/storage.shtml

And follow the instructions.

--Dave

[Ratzie]

We have megaraid2 installed. And I have found some files that state the raid config.

In /proc/megaraid/hba0
Give you alittle, but is there an acutal probe, or some command line utilities?

[Rick Garland]

I believe this is Dell hardware - a PowerEdge server?

If so, Dell would have some utilities